Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Tang, Xingying; Wang, Shuzhong; Qian, Lili; Ren, Mengmeng; Sun, Panpan; Li, Yanhui; Yang, Jian

doi:10.1515/jaots-2016-0119

Cited by 15 publications

(7 citation statements)

References 63 publications

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“…Owing to the potential of use of SC water in next generation nuclear reactors, renewable energy generation systems, efficient treatment of organic waste, and so on, a large volume of corrosion studies have been conducted to examine the effect of SC water on various metals and alloys. Tang et al (2016) have presented an extensive summary of these results (based on 120 published articles from 1994 to 2014) on iron-based alloys, Ni-based alloys, titanium-based alloys, ceramics, and pure metals such as zirconium, niobium, tantalum, and molybdenum. Their conclusion is that "no single material can withstand all kinds of SCWO (SC water oxidation) conditions."…”

Section: Nonreacting and Noncorrodingmentioning

confidence: 99%

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

2022

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Supercritical (SC) fluid, which was discovered exactly two hundred years ago, was initially thought to have only one state with no distinction between the liquid and vapor. It is now considered to have two distinct regions --"liquidlike" and "gas-like," with thermophysical properties exhibiting anomalous behavior near the critical point (CP). This work highlights that the anomalous behavior, as observed above CP in the Widom region, extends to pressures and temperatures much below the critical pressure P c and/or critical temperature T c . Indeed, the anomalous region starts within the subcritical liquid state and extends well into the SC region. Motivated by many applications, extensive research has been devoted to thermal transport by SC water and CO 2 . However, both of these fluids are reactive and corrosive, and require high pressures (P c = 217.8 and 72.8 atm, respectively); SC water also needs high temperature (T c = 373.95°C for water). This paper presents, for the first time, argon as an alternative SC fluid for thermal transport, whose P c is lower (47.994 atm) and it can work at low temperatures (T c = -122.46°C). Argon is easily-available, nonreactive, noncorrosive, and environmentally benign. A thermal transport analysis of fully developed flow of SC Ar through an isothermally heated duct and its comparison with SC CO 2 and water demonstrates that for similar rates of heat transfer, the increase in cost of using argon is small, in terms of flow work required, whereas the benefits are substantial with regard to complexity (due to P c being much lower), operational maintenance, and life of the thermal systems. It is also revealed that 2 to 3 orders-of-magnitude enhancement in gaseous state heat transfer is possible by moving from subcritical to high-supercritical pressures; the effect being more pronounced at lower SC temperatures, even at cryogenic temperatures in contrast to SC CO 2 (T c = 30.98°C) and water.

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Section: Nonreacting and Noncorrodingmentioning

confidence: 99%

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

2022

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“…A summary of the above discussion can be obtained: Advanced nuclear water-cooled reactors, (ultra) supercritical thermal power plants, as well as a series of supercritical water treatment techniques all involve highly harsh sub-/supercritical aqueous systems, which can lead to severe corrosion problems of materials [19,20]. In sub-/supercritical water environments, changes in temperature and pressure can cause changes in water density, dielectric constant, viscosity, and other characteristics.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Li,

Bai,

Xing

et al. 2024

Applied Sciences

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A series of advanced equipment exposed to sub-/supercritical water environments at high temperatures, high pressures, and extreme water chemistry with high salt and dissolved oxygen content faces serious corrosion problems. Obtaining on-site corrosion data for typical materials in harsh environments is crucial for operating and maintaining related equipment and optimizing various corrosion prediction models. First, this article introduces the advantages and disadvantages, usage scenarios, and future development potential of several in situ monitoring technologies, including ultrasonic thickness measurement, the infrared thermography method, microwave imaging, eddy current detection, and acoustic emission. Considering the importance of electrochemical corrosion data in revealing microscale and nanoscale corrosion mechanisms, in situ testing techniques such as electrical resistance probes, electrochemical corrosion potential, electrochemical impedance spectroscopy, and electrochemical noise that can be applied to sub-/supercritical water systems were systematically discussed. The testing platform and typical data obtained were discussed with thick and heavy colors to establish a mechanical prediction model for corrosion behavior. It is of great significance to promote the development of corrosion monitoring techniques, such as breaking through testing temperature limitations and broadening the industrial application scenarios and maturity.

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“…Therefore, the above alloy materials are prone to oxidization and corrosion, resulting in a sharp decrease in the reactor service life. Therefore, it is particularly important to explore advanced reactor materials for the process of supercritical water oxidation [ 4 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Sol–Gel-Derived Ni3Al Coating on Nickel Alloy for Oxidation Resistance in Supercritical Water Environments

et al. 2022

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Although nickel-based alloys are widely used in industries due to their oxidation and corrosion resistance, the pursuit of better performance in harsh environments is still a great challenge. In this work, we developed a sol–gel method to synthesize Ni3Al coating on a nickel alloy, assisted by a post-annealing process, and investigated the oxidation-resistant performance. The coating thickness can be controlled by designing the deposition times, which keep the pure Ni3Al phase stable. In addition, the surface morphologies indicate that the coating is compact without obvious voids or cracks. Furthermore, the oxidation-resistant property of the coating was investigated by carrying out a supercritical water oxidation experiment. The crystalline structure and surface morphology of the samples before and after 72-h oxidation demonstrated the superior oxidation resistance of the coating. This work provides a convenient method to fabricate an oxidation-resistant coating on a nickel-based alloy, which would be significant for prolonging the service life of vessels under oxidation conditions, especially for supercritical water reactions.

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Corrosion Properties of Candidate Materials in Supercritical Water Oxidation Process

Cited by 15 publications

References 63 publications

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

Existence of Supercritical "Liquid-Like" State in Subcritical Region, Optimal Heat Transfer Enhancement, and Argon as a Nonreacting, Noncorroding Sc Heat Transfer Fluid

Corrosion Monitoring Techniques in Subcritical and Supercritical Water Environments

Sol–Gel-Derived Ni3Al Coating on Nickel Alloy for Oxidation Resistance in Supercritical Water Environments

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